Debt and Credit Facility Debt and Credit Facility (Tables)

12 Months Ended

Dec. 31, 2013

Debt Instrument [Line Items]

Schedule of Long-term Debt Instruments [Table Text Block]

The following table summarizes the carrying amount of our borrowings under various financing arrangements (in thousands):

				Interest	December 31,
Type of Borrowing	Description	Issue Date	Due Date	Rate	2013		2012
Convertible Senior	May 2013 Notes	April 2006	May 2013	0.625%	$	—	$	419,433
Convertible Senior	May 2014 Notes	July 2010	May 2014	1.00%	234,217		1,210,213
Convertible Senior	May 2016 Notes	July 2010	May 2016	1.625%	1,113,043		1,157,692
Senior Unsecured	April 2021 Notes	March 2011	April 2021	4.50%	993,781		992,923
Senior Unsecured	December 2014 Notes	December 2011	December 2014	2.40%	749,710		749,394
Senior Unsecured	December 2016 Notes	December 2011	December 2016	3.05%	699,326		699,095
Senior Unsecured	December 2021 Notes	December 2011	December 2021	4.40%	1,247,716		1,247,428
Senior Unsecured	December 2041 Notes	December 2011	December 2041	5.65%	997,885		997,810
Credit Facility	Five-Year Revolver	January 2012	January 2017	Variable	600,000		750,000
Total debt, net					6,635,678		8,223,988
Less current portion					2,696,970		1,169,433
Total long-term debt, net					$	3,938,708	$	7,054,555

Schedule of Maturities of Long-term Debt [Table Text Block]

the aggregate maturities of financing obligations due subsequent to December 31, 2013, are as follows (in thousands):

Maturity Date	Amount
2014	$	2,761,091
2015	—
2016	700,000
2017	—
2018	—
Total	$	3,461,091

Convertible Senior Notes Due In May 2013 [Member]

Debt Instrument [Line Items]

Equity and Liability Components of the Convertible Notes [Table Text Block]

The following table summarizes information about the equity and liability components of the May 2013 Notes (in thousands):

	Carrying Value of Equity Component				Net Carrying Amount of Liability Component				Unamortized Discount of Liability Component
	December 31,				December 31,				December 31,
	2013		2012		2013		2012		2013		2012
May 2013 convertible senior notes	$	—	$	126,839	$	—	$	419,433	$	—	$	(7,147	)

Convertible Senior Notes Due in May 2014 and May 2016 [Member]

Debt Instrument [Line Items]

Equity and Liability Components of the Convertible Notes [Table Text Block]

The following table summarizes information about the equity and liability components of the May 2014 Notes and May 2016 Notes (in thousands):

	Carrying Value of Equity Component				Net Carrying Amount of Liability Component				Unamortized Discount of Liability Component
	December 31,				December 31,				December 31,
	2013		2012		2013		2012		2013			2012
May 2014 convertible senior notes	$	20,306	$	107,496	$	234,217	$	1,210,213	$	(1,907	)	$	(39,787	)
May 2016 convertible senior notes	142,912		152,039		1,113,043		1,157,692		(61,924		)	(92,308		)
Total May 2014 and 2016 convertible senior notes	$	163,218	$	259,535	$	1,347,260	$	2,367,905	$	(63,831	)	$	(132,095	)